Abstract
A marching Euler solver, GEM3D, was used to predict the Mach 3 flowfield for the wing and body of a Highspeed Civil Transport (HSCT) concept. The analysis focused on a typical cruise lift coefficient of 0.1 at a = 3 deg. The Euler solution indicated that embedded shocks formed on the upper surface of the inboard wing panel and at the leading edge of the outboard wing panel caused by its supersonic leading-edge condition. According to a simple static-pressure criterion, the embedded wing upper-surface shocks were sufficiently strong to separate a turbulent boundary layer. Comparison of aerodynamic coefficients from the Euler solver with those from linear theory showed that the linear theory estimates of lift and drag were optimistic, which would lead to optimistic estimates of cruise range.
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